<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        /* 测试一 */
        // function A () {}
        // A.prototype.n = 1
        // const b = new A()

        // A.prototype = { 
        //     n: 2,
        //     m: 3
        // }

        // const c = new A()
        // console.log(b.n, b.m, c.n, c.m)

        /* 测试二 */
        const F = function(){}
        Object.prototype.a = function(){ 
            console.log('a()')
        }
        Function.prototype.b = function() { 
            console.log('b()')
        }
        const f = new F()
        f.a()
        f.b()
        F.a()
        F.b()
    </script>
</body>
</html>